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Ring replacement on Allis Chalmers engine

F

FtInn Farmer

Member
In a previous posting, I stated that I have the head off an AC ca tractor and one of the pistons is marked different (3 @8-2-R, 1@ 1590-R) than the other three. I have poured some light-weight oil into each cylinder to check the rings seals. After about 60 hours of sitting, the 8-2-R pistons (1,2,4) are still holding oil, but the cylinder with the 1590-R (3) piston is dry. Can I just pull that one piston; check and repair as required?
 
You can, but that would be something reserved for an extreme low budget project. Also consider what the tractor will be used for. If it's a working tractor, short cuts will come back to haunt you. If it's a show tractor you can get by with more, but still don't want it dripping oil or smoking.

Typically when you are going into something like this, it is best to fix as much as you can to avoid having to go back in. The old saying, "There is never time to do it right, but always time to do it over!" comes to mind.

Being there are different markings on the pistons says someone has been there before. That could be a good thing, or it could be a very bad thing, just depends on why and what was done.

I would at least pull the other pistons, look them over, check the ring gaps and ring lands, skirt clearance, feel the wrist pins, check the rod bearings. Then you can make a better decision, go back with a little peace of mind instead of guessing.

A few more parts won't be that expensive. Best to solve as many problems as possible while it's apart.
 
I agree with what Steve says totally. I would pull the one piston out and check the ring gaps and piston clearance but would also pull one of the others to compare pistons. It is hard to find a single used piston that is within specs. Most people do not have the instruments to measure to know if they are in spec.
 
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